That seems more like "wire" to me than "shaft". Why would you start with a 100mm piece?
I'd start with a 70mm piece of 4mm stock, (approx. .157" Dia. for our U.S. buddies) and machine the ends with the material projecting from the chuck (or preferably collet) as little as posible. If the 3mm x 8mm (.118" x .315) ends are actually to be drilled and tapped M2.50 (.098") I would say it's an impossible job.
The 3mm Dia ends tapped 2.5mm would have a wall approximately .25mm ( .010") That's feeler gauge thickness!
Boy! alotta people posted while I henpecked out my response.
Did anybody consider the size? Mayhem what size 4 jaw chuck would hold 4mm D. rod?
I'd start with a 70mm piece of 4mm stock, (approx. .157" Dia. for our U.S. buddies) and machine the ends with the material projecting from the chuck (or preferably collet) as little as posible. If the 3mm x 8mm (.118" x .315) ends are actually to be drilled and tapped M2.50 (.098") I would say it's an impossible job.
The 3mm Dia ends tapped 2.5mm would have a wall approximately .25mm ( .010") That's feeler gauge thickness!
Boy! alotta people posted while I henpecked out my response.
Did anybody consider the size? Mayhem what size 4 jaw chuck would hold 4mm D. rod?
Busy Bee 12-36 lathe, Busy Bee Mill drill, Busy Bee 4x6 bandsaw, Homemade 9x17 bandsaw, Ad infinitum.